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172 results on '"Delayen, J."'

1. The Continuous Electron Beam Accelerator Facility at 12 GeV

Author

Adderley, P. A., Ahmed, S., Allison, T., Bachimanchi, R., Baggett, K., BastaniNejad, M., Bevins, B., Bevins, M., Bickley, M., Bodenstein, R. M., Bogacz, S. A., Bruker, M., Burrill, A., Cardman, L., Creel, J., Chao, Y. -C., Cheng, G., Ciovati, G., Chattopadhyay, S., Clark, J., Clemens, W. A., Croke, G., Daly, E., Davis, G. K., Delayen, J., De Silva, S. U., Dickson, R., Diaz, M., Drury, M., Doolittle, L., Douglas, D., Feldl, E., Fischer, J., Freyberger, A., Ganni, V., Geng, R. L., Ginsburg, C., Gomez, J., Grames, J., Gubeli, J., Guo, J., Hannon, F., Hansknecht, J., Harwood, L., Henry, J., Hernandez-Garcia, C., Higgins, S., Higinbotham, D., Hofler, A. S., Hiatt, T., Hogan, J., Hovater, C., Hutton, A., Jones, C., Jordan, K., Joyce, M., Kazimi, R., Keesee, M., Kelley, M. J., Keppel, C., Kimber, A., King, L., Kjeldsen, P., Kneisel, P., Koval, J., Krafft, G. A., Lahti, G., Larrieu, T., Lauze, R., Leemann, C., Legg, R., Li, R., Lin, F., Machie, D., Mammosser, J., Macha, K., Mahoney, K., Marhauser, F., Mastracci, B., Matalevich, J., McCarter, J., McCaughan, M., Merminga, L., Michaud, R., Morozov, V., Mounts, C., Musson, J., Nelson, R., Oren, W., Overton, R. B., Palacios-Serrano, G., Park, H. -K., Phillips, L., Philip, S., Pilat, F., Plawski, T., Poelker, M., Powers, P., Powers, T., Preble, J., Reilly, T., Rimmer, R., Reece, C., Robertson, H., Roblin, Y., Rode, C., Satogata, T., Seidman, D. J., Seryi, A., Shabalina, A., Shin, I., Slominski, R., Slominski, C., Spata, M., Spell, D., Spradlin, J., Stirbet, M., Stutzman, M. L., Suhring, S., Surles-Law, K., Suleiman, R., Tennant, C., Tian, H., Turner, D., Tiefenback, M., Trofimova, O., Valente, A. -M., Wang, H., Wang, Y., White, K., Whitlatch, C., Whitlatch, T., Wiseman, M., Wissman, M. J., Wu, G., Yang, S., Yunn, B., Zhang, S., and Zhang, Y.

Subjects
Physics - Accelerator Physics, Nuclear Experiment
Abstract

This review paper describes the energy-upgraded CEBAF accelerator. This superconducting linac has achieved 12 GeV beam energy by adding 11 new high-performance cryomodules containing eighty-eight superconducting cavities that have operated CW at an average accelerating gradient of 20 MV/m. After reviewing the attributes and performance of the previous 6 GeV CEBAF accelerator, we discuss the upgraded CEBAF accelerator system in detail with particular attention paid to the new beam acceleration systems. In addition to doubling the acceleration in each linac, the upgrade included improving the beam recirculation magnets, adding more helium cooling capacity to allow the newly installed modules to run cold, adding a new experimental hall, and improving numerous other accelerator components. We review several of the techniques deployed to operate and analyze the accelerator performance, and document system operating experience and performance. In the final portion of the document, we present much of the current planning regarding projects to improve accelerator performance and enhance operating margins, and our plans for ensuring CEBAF operates reliably into the future. For the benefit of potential users of CEBAF, the performance and quality measures for beam delivered to each of the experimental halls is summarized in the appendix., Comment: 66 pages, 73 figures, 21 tables

Published
2024
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2. Temperature, RF Field, and Frequency Dependence Performance Evaluation of Superconducting Niobium Half-Wave Cavity

Author

Raut, N. K., Khanal, B. D., Tiskumara, J. K., De Silva, S., Dhakal, P., Ciovati1, G., and Delayen, J. R.

Subjects
Condensed Matter - Superconductivity
Abstract

Recent advancement in superconducting radio frequency cavity processing techniques, with diffusion of impurities within the RF penetration depth, resulted in high quality factor with increase in quality factor with increasing accelerating gradient. The increase in quality factor is the result of a decrease in the surface resistance as a result of nonmagnetic impurities doping and change in electronic density of states. The fundamental understanding of the dependence of surface resistance on frequency and surface preparation is still an active area of research. Here, we present the result of RF measurements of the TEM modes in a coaxial half wave niobium cavity resonating at frequencies between 0.3-1.3 GHz. The temperature dependence of the surface resistance was measured between 4.2 K and 1.6 K. The field dependence of the surface resistance was measured at 2.0 K. The baseline measurements were made after standard surface preparation by buffered chemical polishing., Comment: 21st International Conference on Radio-Frequency Superconductivity (SRF 2023)

Published
2023

3. Development and Performance of RFD Crab Cavity Prototypes for HL-LHC AUP

Author

Ristori, L., Berrutti, P., Narduzzi, M., Delayen, J., de Silva, S., Li, Z., Ratti, A., Huque, N., and Castilla, A.

Subjects
Physics - Accelerator Physics
Abstract

The US will be contributing to the HL-LHC upgrade at CERN with the fabrication and qualification of RFD crabbing cavities in the framework of the HL-LHC Accelerator Upgrade Project (AUP) managed by Fermilab. AUP received Critical Decision 3 (CD-3) approval by DOE in December 2020 launching the project into the production phase. The electro-magnetic design of the cavity was inherited from the LHC Accelerator Research Program (LARP) but needed to be revised to meet new project requirements and to prevent issues encountered during beam tests performed at CERN in the R&D phase. Two prototype cavities were manufactured in industry and cold tested. Challenges specific to the RFD cavity were the stringent interface tolerances, the pole symmetry, and the higher-order-mode impedance spectrum. Chemical processing and heat treatments were performed initially at FNAL/ANL and are now being transferred to industry for the production phase. HOM dampers are manufactured and validated by JLAB. A summary of cold test results with and without HOM dampers is presented., Comment: 21st International Conference on RF Superconductivity (SRF23)

Published
2023

4. Next-Generation Superconducting RF Technology based on Advanced Thin Film Technologies and Innovative Materials for Accelerator Enhanced Performance and Energy Reach

Author

Valente-Feliciano, A. - M., Antoine, C., Anlage, S., Ciovati, G., Delayen, J., Gerigk, F., Gurevich, A., Junginger, T., Keckert, S., Keppe, G., Knobloch, J., Kubo, T., Kugeler, O., Manos, D., Pira, C., Proslier, T., Pudasaini, U., Reece, C. E., Rimmer, R. A., Rosaz, G. J., Saeki, T., Vaglio, R., Valizadeh, R., Vennekate, H., Delsolaro, W. Venturini, Vogel, M., Welander, P. B., and Wenskat, M.

Subjects
Physics - Accelerator Physics
Abstract

Superconducting RF is a key technology for future particle accelerators, now relying on advanced surfaces beyond bulk Nb for a leap in performance and efficiency. The SRF thin film strategy aims at transforming the current SRF technology by using highly functional materials, addressing all the necessary functions. The community is deploying efforts in three research thrusts to develop next-generation thin-film based cavities. Nb on Cu cavities are developed to perform as good as or better than bulk Nb at reduced cost and with better thermal stability. Recent results showing improved accelerating field and dramatically reduced Q slope show their potential for many applications. The second research thrust is to develop cavities coated with materials that can operate at higher temperatures or sustain higher fields. Proof of principle has been established for the merit of Nb3Sn for SRF application. Research is now needed to further exploit the material and reach its full potential with novel deposition techniques. The third line of research is to push SRF performance beyond the capabilities of the superconductors alone with multilayered coatings. In parallel, developments are needed to provide quality substrates, cooling schemes and cryomodule design tailored to thin film cavities. Recent results in these three research thrusts suggest that SRF thin film technologies are at the eve of a technological revolution. For them to mature, active community support and sustained funding are needed to address fundamental developments supporting material deposition techniques, surface and RF research, technical challenges associated with scaling and industrialization. With dedicated and sustained investment, next-generation thin-film based cavities will become a reality with high performance and efficiency, facilitating energy sustainable science while enabling higher luminosity, and higher energy., Comment: Contribution to Snowmass 2021

Published
2022

5. Key directions for research and development of superconducting radio frequency cavities

Author

Belomestnykh, S., Posen, S., Bafia, D., Balachandran, S., Bertucci, M., Burrill, A., Cano, A., Checchin, M., Ciovati, G., Cooley, L. D., Semione, G. Dalla Lana, Delayen, J., Eremeev, G., Furuta, F., Gerigk, F., Giaccone, B., Gonnella, D., Grassellino, A., Gurevich, A., Hillert, W., Iavarone, M., Knobloch, J., Kubo, T., Kwok, W. K., Laxdal, R., Lee, P. J., Liepe, M., Martinello, M., Melnychuk, O. S., Nassiri, A., Netepenko, A., Padamsee, H., Pagani, C., Paparella, R., Pudasaini, U., Reece, C. E., Reschke, D., Romanenko, A., Ross, M., Saito, K., Sauls, J., Seidman, D. N., Solyak, N., Sung, Z., Umemori, K., Valente-Feliciano, A. -M., Delsolaro, W. Venturini, Walker, N., Weise, H., Welp, U., Wenskat, M., Wu, G., Xi, X. X., Yakovlev, V., Yamamoto, A., and Zasadzinski, J.

Subjects
Physics - Accelerator Physics
Abstract

Radio frequency superconductivity is a cornerstone technology for many future HEP particle accelerators and experiments from colliders to proton drivers for neutrino facilities to searches for dark matter. While the performance of superconducting RF (SRF) cavities has improved significantly over the last decades, and the SRF technology has enabled new applications, the proposed HEP facilities and experiments pose new challenges. To address these challenges, the field continues to generate new ideas and there seems to be a vast room for improvements. In this paper we discuss the key research directions that are aligned with and address the future HEP needs., Comment: contribution to Snowmass 2021

Published
2022

6. Determination of the magnetic field dependence of the surface resistance of superconductors from cavity tests

Author

Delayen, J. R., Park, H., De Silva, S. U., Ciovati, G., and Li, Z.

Subjects
Physics - Accelerator Physics
Abstract

We present a general method to derive the magnetic field dependence of the surface resistance of superconductors from the Q-curves obtained during the cryogenic tests of cavities. The results are applied to coaxial half-wave cavities, TM-like "elliptical" accelerating cavities, and cavities of more complicated geometries.

Published
2018
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7. High-brilliance, high-flux compact inverse Compton light source

Author

Deitrick, K. E., Krafft, G. A., Terzić, B., and Delayen, J. R.

Subjects
Physics - Accelerator Physics
Abstract

A compact Inverse Compton Light Source (ICLS) design is presented, with flux and brilliance orders of magnitude beyond conventional laboratory-scale sources and other compact ICLS designs. This design utilizes the physics of inverse Compton scattering of an extremely low emittance electron beam by a laser pulse of rms length of approximately two-thirds of a picosecond (2/3 ps). The accelerator is composed of a superconducting radiofrequency (SRF) reentrant gun followed by four double-spoke SRF cavities. After the linac are three quadrupole magnets to focus the electron beam to the interaction point (IP). The distance from cathode surface to IP is less than 6 meters, with the cathode producing electron bunches with a bunch charge of 10 pC and a few picoseconds in length. The incident laser has 1 MW circulating power, a 1 micron wavelength, and a spot size of 3.2 microns at the IP. The repetition rate of this source is 100 MHz, in order to achieve a high flux despite the low bunch charge. The anticipated X-ray source parameters include an energy of 12 keV, with a total flux of $1.4\times10^{14}$ ph/s, the flux into a 0.1% bandwidth of $2.1\times10^{11}$ ph/(s-0.1%BW), and the average brilliance of $2.2\times10^{15}$ ph/(s-mm$^2$-mrad$^2$-0.1%BW)., Comment: 19 pages, 18 figures; Submitted to Phys. Rev. Accel. Beams

Published
2018
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8. Science Requirements and Conceptual Design for a Polarized Medium Energy Electron-Ion Collider at Jefferson Lab

Author

Abeyratne, S., Accardi, A., Ahmed, S., Barber, D., Bisognano, J., Bogacz, A., Castilla, A., Chevtsov, P., Corneliussen, S., Deconinck, W., Degtiarenko, P., Delayen, J., Derbenev, Ya., DeSilva, S., Douglas, D., Dudnikov, V., Ent, R., Erdelyi, B., Evtushenko, P., Filatov, Yu., Gaskell, D., Geng, R., Guzey, V., Horn, T., Hutton, A., Hyde, C., Johnson, R., Kim, Y., Klein, F., Kondratenko, A., Kondratenko, M., Krafft, G., Li, R., Lin, F., Manikonda, S., Marhauser, F., McKeown, R., Morozov, V., Nadel-Turonski, P., Nissen, E., Ostroumov, P., Pivi, M., Pilat, F., Poelker, M., Prokudin, A., Rimmer, R., Satogata, T., Sayed, H., Spata, M., Sullivan, M., Tennant, C., Terzić, B., Tiefenback, M., Wang, H., Wang, S., Weiss, C., Yunn, B., and Zhang, Y.

Subjects
Physics - Accelerator Physics, High Energy Physics - Experiment
Abstract

This report presents a brief summary of the science opportunities and program of a polarized medium energy electron-ion collider at Jefferson Lab and a comprehensive description of the conceptual design of such a collider based on the CEBAF electron accelerator facility., Comment: 160 pages, ~93 figures This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC05-06OR23177, DE-AC02-06CH11357, DE-AC05-060R23177, and DESC0005823. The U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce this manuscript for U.S. Government purposes

Published
2012

11. The Spallation Neutron Source accelerator system design

Author

Henderson, S., Abraham, W., Aleksandrov, A., Allen, C., Alonso, J., Anderson, D., Arenius, D., Arthur, T., Assadi, S., Ayers, J., Bach, P., Badea, V., Battle, R., Beebe-Wang, J., Bergmann, B., Bernardin, J., Bhatia, T., Billen, J., Birke, T., Bjorklund, E., Blaskiewicz, M., Blind, B., Blokland, W., Bookwalter, V., Borovina, D., Bowling, S., Bradley, J., Brantley, C., Brennan, J., Brodowski, J., Brown, S., Brown, R., Bruce, D., Bultman, N., Cameron, P., Campisi, I., Casagrande, F., Catalan-Lasheras, N., Champion, M., Chen, Z., Cheng, D., Cho, Y., Christensen, K., Chu, C., Cleaves, J., Connolly, R., Cote, T., Cousineau, S., Crandall, K., Creel, J., Crofford, M., Cull, P., Cutler, R., Dabney, R., Dalesio, L., Daly, E., Damm, R., Danilov, V., Davino, D., Davis, K., Dawson, C., Day, L., Deibele, C., Delayen, J., DeLong, J., Demello, A., DeVan, W., Digennaro, R., Dixon, K., Dodson, G., Doleans, M., Doolittle, L., Doss, J., Drury, M., Elliot, T., Ellis, S., Error, J., Fazekas, J., Fedotov, A., Feng, P., Fischer, J., Fox, W., Fuja, R., Funk, W., Galambos, J., Ganni, V., Garnett, R., Geng, X., Gentzlinger, R., Giannella, M., Gibson, P., Gillis, R., Gioia, J., Gordon, J., Gough, R., Greer, J., Gregory, W., Gribble, R., Grice, W., Gurd, D., Gurd, P., Guthrie, A., Hahn, H., Hardek, T., Hardekopf, R., Harrison, J., Hatfield, D., He, P., Hechler, M., Heistermann, F., Helus, S., Hiatt, T., Hicks, S., Hill, J., Hoff, L., Hoff, M., Hogan, J., Holding, M., Holik, P., Holmes, J., Holtkamp, N., Hovater, C., Howell, M., Hseuh, H., Huhn, A., Hunter, T., Ilg, T., Jackson, J., Jain, A., Jason, A., Jeon, D., Johnson, G., Jones, A., Joseph, S., Justice, A., Kang, Y., Kasemir, K., Keller, R., Kersevan, R., Kerstiens, D., Kesselman, M., Kim, S., Kneisel, P., Kravchuk, L., Kuneli, T., Kurennoy, S., Kustom, R., Kwon, S., Ladd, P., Lambiase, R., Lee, Y.Y., Leitner, M., Leung, K.-N., Lewis, S., Liaw, C., Lionberger, C., Lo, C.C., Long, C., Ludewig, H., Ludvig, J., Luft, P., Lynch, M., Ma, H., MacGill, R., Macha, K., Madre, B., Mahler, G., Mahoney, K., Maines, J., Mammosser, J., Mann, T., Marneris, I., Marroquin, P., Martineau, R., Matsumoto, K., McCarthy, M., McChesney, C., McGahern, W., McGehee, P., Meng, W., Merz, B., Meyer, R., Jr., Meyer, R., Sr., Miller, B., Mitchell, R., Mize, J., Monroy, M., Munro, J., Murdoch, G., Musson, J., Nath, S., Nelson, R., O׳Hara, J., Olsen, D., Oren, W., Oshatz, D., Owens, T., Pai, C., Papaphilippou, I., Patterson, N., Patterson, J., Pearson, C., Pelaia, T., Pieck, M., Piller, C., Plawski, T., Plum, M., Pogge, J., Power, J., Powers, T., Preble, J., Prokop, M., Pruyn, J., Purcell, D., Rank, J., Raparia, D., Ratti, A., Reass, W., Reece, K., Rees, D., Regan, A., Regis, M., Reijonen, J., Rej, D., Richards, D., Richied, D., Rode, C., Rodriguez, W., Rodriguez, M., Rohlev, A., Rose, C., Roseberry, T., Jr., Rowton, L., Roybal, W., Rust, K., Salazer, G., Sandberg, J., Saunders, J., Schenkel, T., Schneider, W., Schrage, D., Schubert, J., Severino, F., Shafer, R., Shea, T., Shishlo, A., Shoaee, H., Sibley, C., Sims, J., Smee, S., Smith, J., Smith, K., Spitz, R., Staples, J., Stein, P., Stettler, M., Stirbet, M., Stockli, M., Stone, W., Stout, D., Stovall, J., Strelo, W., Strong, H., Sundelin, R., Syversrud, D., Szajbler, M., Takeda, H., Tallerico, P., Tang, J., Tanke, E., Tepikian, S., Thomae, R., Thompson, D., Thomson, D., Thuot, M., Treml, C., Tsoupas, N., Tuozzolo, J., Tuzel, W., Vassioutchenko, A., Virostek, S., Wallig, J., Wanderer, P., Wang, Y., Wang, J.G., Wangler, T., Warren, D., Wei, J., Weiss, D., Welton, R., Weng, J., Weng, W-T., Wezensky, M., White, M., Whitlatch, T., Williams, D., Williams, E., Wilson, K., Wiseman, M., Wood, R., Wright, P., Wu, A., Ybarrolaza, N., Young, K., Young, L., Yourd, R., Zachoszcz, A., Zaltsman, A., Zhang, S., Zhang, W., Zhang, Y., and Zhukov, A.

Published
2014
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15. Next-Generation Superconducting RF Technology based on Advanced Thin Film Technologies and Innovative Materials for Accelerator Enhanced Performance and Energy Reach

Author

Valente-Feliciano, A.-.M., Antoine, C., Anlage, S., Ciovati, G., Delayen, J., Gerigk, F., Gurevich, A., Junginger, T., Keckert, S., Keppe, G., Knobloch, J., Kubo, T., Kugeler, O., Manos, D., Pira, C., Proslier, T., Pudasaini, U., Reece, C.E., Rimmer, R.A., Rosaz, G.J., Saeki, T., Vaglio, R., Valizadeh, R., Vennekate, H., Delsolaro, W. Venturini, Vogel, M., Welander, P.B., Wenskat, M., HEP, INSPIRE, Département des Accélérateurs, de Cryogénie et de Magnétisme (ex SACM) (DACM), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Accelerator Physics (physics.acc-ph), [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], FOS: Physical sciences, Physics - Accelerator Physics, [PHYS.PHYS.PHYS-ACC-PH] Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Accelerators and Storage Rings, physics.acc-ph
Abstract

Superconducting RF is a key technology for future particle accelerators, now relying on advanced surfaces beyond bulk Nb for a leap in performance and efficiency. The SRF thin film strategy aims at transforming the current SRF technology by using highly functional materials, addressing all the necessary functions. The community is deploying efforts in three research thrusts to develop next-generation thin-film based cavities. Nb on Cu cavities are developed to perform as good as or better than bulk Nb at reduced cost and with better thermal stability. Recent results showing improved accelerating field and dramatically reduced Q slope show their potential for many applications. The second research thrust is to develop cavities coated with materials that can operate at higher temperatures or sustain higher fields. Proof of principle has been established for the merit of Nb3Sn for SRF application. Research is now needed to further exploit the material and reach its full potential with novel deposition techniques. The third line of research is to push SRF performance beyond the capabilities of the superconductors alone with multilayered coatings. In parallel, developments are needed to provide quality substrates, cooling schemes and cryomodule design tailored to thin film cavities. Recent results in these three research thrusts suggest that SRF thin film technologies are at the eve of a technological revolution. For them to mature, active community support and sustained funding are needed to address fundamental developments supporting material deposition techniques, surface and RF research, technical challenges associated with scaling and industrialization. With dedicated and sustained investment, next-generation thin-film based cavities will become a reality with high performance and efficiency, facilitating energy sustainable science while enabling higher luminosity, and higher energy., Comment: Contribution to Snowmass 2021

Published
2022

18. First demonstration of the use of crab cavities on hadron beams

Author

Calaga, R., primary, Alekou, A., additional, Antoniou, F., additional, Appleby, R. B., additional, Arnaudon, L., additional, Artoos, K., additional, Arduini, G., additional, Baglin, V., additional, Barriere, S., additional, Bartosik, H., additional, Baudrenghien, P., additional, Ben-Zvi, I., additional, Bohl, T., additional, Boucherie, A., additional, Brüning, O. S., additional, Brodzinski, K., additional, Butterworth, A., additional, Burt, G., additional, Capatina, O., additional, Calvo, S., additional, Capelli, T., additional, Carlà, M., additional, Carra, F., additional, Carver, L. R., additional, Castilla-Loeza, A., additional, Daly, E., additional, Dassa, L., additional, Delayen, J., additional, De Silva, S. U., additional, Dexter, A., additional, Garlasche, M., additional, Gerigk, F., additional, Giordanino, L., additional, Glenat, D., additional, Guinchard, M., additional, Harrison, A., additional, Jensen, E., additional, Julie, C., additional, Jones, T., additional, Killing, F., additional, Krawczyk, A., additional, Levens, T., additional, Leuxe, R., additional, Lindstrom, B., additional, Li, Z., additional, MacEwen, A., additional, Macpherson, A., additional, Menendez, P., additional, Mikkola, T., additional, Minginette, P., additional, Mitchell, J., additional, Montesinos, E., additional, Papotti, G., additional, Park, H., additional, Pasquino, C., additional, Pattalwar, S., additional, Pleite, E. C., additional, Powers, T., additional, Prochal, B., additional, Ratti, A., additional, Rossi, L., additional, Rude, V., additional, Therasse, M., additional, Tomás, R., additional, Stapley, N., additional, Santillana, I., additional, Shipman, N., additional, Simonin, J., additional, Sosin, M., additional, Swieszek, J., additional, Templeton, N., additional, Vandoni, G., additional, Verdú-Andrés, S., additional, Wartak, M., additional, Welsch, C., additional, Wollman, D., additional, Wu, Q., additional, Xiao, B., additional, Yamakawa, E., additional, Zanoni, C., additional, Zimmermann, F., additional, and Zwozniak, A., additional

Published
2021
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19. First demonstration of the use of crab cavities on hadron beams

Author

Calaga, R., Alekou, A., Antoniou, F., Appleby, R.B., Arnaudon, L., Artoos, K., Arduini, G., Baglin, V., Barriere, S., Bartosik, H., Baudrenghien, P., Ben-Zvi, I., Bohl, T., Boucherie, A., Brüning, O.S., Brodzinski, K., Butterworth, A., Burt, G., Capatina, O., Calvo, S., Capelli, T., Carlà, M., Carra, F., Carver, L.R., Castilla-Loeza, A., Daly, E., Dassa, L., Delayen, J., De Silva, S.U., Dexter, A., Garlasche, M., Gerigk, F., Giordanino, L., Glenat, D., Guinchard, M., Harrison, A., Jensen, E., Julie, C., Jones, T., Killing, F., Krawczyk, A., Levens, T., Leuxe, R., Lindstrom, B., Li, Z., MacEwen, A., MacPherson, A., Menendez, P., Mikkola, T., Minginette, P., Mitchell, J., Montesinos, E., Papotti, G., Park, H., Pasquino, C., Pattalwar, S., Pleite, E.C., Powers, T., Prochal, B., Ratti, A., Rossi, L., Rude, V., Therasse, M., Tomás, R., Stapley, N., Santillana, I., Shipman, N., Simonin, J., Sosin, M., Swieszek, J., Templeton, N., Vandoni, G., Verdú-Andrés, S., Wartak, M., Welsch, C., Wollman, D., Wu, Q., Xiao, B., Yamakawa, E., Zanoni, C., Zimmermann, F., Zwozniak, A., Calaga, R., Alekou, A., Antoniou, F., Appleby, R.B., Arnaudon, L., Artoos, K., Arduini, G., Baglin, V., Barriere, S., Bartosik, H., Baudrenghien, P., Ben-Zvi, I., Bohl, T., Boucherie, A., Brüning, O.S., Brodzinski, K., Butterworth, A., Burt, G., Capatina, O., Calvo, S., Capelli, T., Carlà, M., Carra, F., Carver, L.R., Castilla-Loeza, A., Daly, E., Dassa, L., Delayen, J., De Silva, S.U., Dexter, A., Garlasche, M., Gerigk, F., Giordanino, L., Glenat, D., Guinchard, M., Harrison, A., Jensen, E., Julie, C., Jones, T., Killing, F., Krawczyk, A., Levens, T., Leuxe, R., Lindstrom, B., Li, Z., MacEwen, A., MacPherson, A., Menendez, P., Mikkola, T., Minginette, P., Mitchell, J., Montesinos, E., Papotti, G., Park, H., Pasquino, C., Pattalwar, S., Pleite, E.C., Powers, T., Prochal, B., Ratti, A., Rossi, L., Rude, V., Therasse, M., Tomás, R., Stapley, N., Santillana, I., Shipman, N., Simonin, J., Sosin, M., Swieszek, J., Templeton, N., Vandoni, G., Verdú-Andrés, S., Wartak, M., Welsch, C., Wollman, D., Wu, Q., Xiao, B., Yamakawa, E., Zanoni, C., Zimmermann, F., and Zwozniak, A.

Abstract

Many future particle colliders require beam crabbing to recover geometric luminosity loss from the nonzero crossing angle at the interaction point (IP). A first demonstration experiment of crabbing with hadron beams was successfully carried out with high energy protons. This breakthrough result is fundamental to achieve the physics goals of the high luminosity LHC (HL-LHC) and the future circular collider (FCC). The expected peak luminosity gain (related to collision rate) is 65% for HL-LHC and even greater for the FCC. Novel beam physics experiments with proton beams in CERN's Super Proton Synchrotron (SPS) were performed to demonstrate several critical aspects for the operation of crab cavities in the future HL-LHC including transparency with a pair of cavities, a full characterization of the cavity impedance with high beam currents, controlled emittance growth from crab cavity induced rf noise. © 2021 American Physical Society. All rights reserved.

Published
2021

20. High-Luminosity Large Hadron Collider (HL-LHC): Technical design report

Author

Aberle, O., Béjar Alonso, I, Brüning, O, Fessia, P, Rossi, L, Tavian, L, Zerlauth, M, Adorisio, C., Adraktas, A., Ady, M., Albertone, J., Alberty, L., Alcaide Leon, M., Alekou, A., Alesini, D., Ferreira, B. Almeida, Lopez, P. Alvarez, Ambrosio, G., Andreu Munoz, P., Anerella, M., Angal-Kalinin, D., Antoniou, F., Apollinari, G., Apollonio, A., Appleby, R., Arduini, G., Alonso, B. Arias, Artoos, K., Atieh, S., Auchmann, B., Badin, V., Baer, T., Baffari, D., Baglin, V., Bajko, M., Ball, A., Ballarino, A., Bally, S., Bampton, T., Banfi, D., Barlow, R., Barnes, M., Barranco, J., Barthelemy, L., Bartmann, W., Bartosik, H., Barzi, E., Battistin, M., Baudrenghien, P., Alonso, I. Bejar, Belomestnykh, S., Benoit, A., Ben-Zvi, I., Bertarelli, A., Bertolasi, S., Bertone, C., Bertran, B., Bestmann, P., Biancacci, N., Bignami, A., Bliss, N., Boccard, C., Body, Y., Borburgh, J., Bordini, B., Borralho, F., Bossert, R., Bottura, L., Boucherie, A., Bozzi, R., Bracco, C., Bravin, E., Bregliozzi, G., Brett, D., Broche, A., Brodzinski, K., Broggi, F., Bruce, R., Brugger, M., Brüning, O., Buffat, X., Burkhardt, H., Burnet, J., Burov, A., Burt, G., Cabezas, R., Cai, Y., Calaga, R., Calatroni, S., Capatina, O., Capelli, T., Cardon, P., Carlier, E., Carra, F., Carvalho, A., Carver, L.R., Caspers, F., Cattenoz, G., Cerutti, F., Chancé, A., Rodrigues, M. Chastre, Chemli, S., Cheng, D., Chiggiato, P., Chlachidze, G., Claudet, S., Coello De Portugal, JM., Collazos, C., Corso, J., Costa Machado, S., Costa Pinto, P., Coulinge, E., Crouch, M., Cruikshank, P., Cruz Alaniz, E., Czech, M., Dahlerup-Petersen, K., Dalena, B., Daniluk, G., Danzeca, S., Day, H., De Carvalho Saraiva, J., De Luca, D., De Maria, R., De Rijk, G., De Silva, S., Dehning, B., Delayen, J., Deliege, Q., Delille, B., Delsaux, F., Denz, R., Devred, A., Dexter, A., Di Girolamo, B., Dietderich, D., Dilly, J.W., Doherty, A., Dos Santos, N., Drago, A., D.Drskovic, Ramos, D. Duarte, Ducimetière, L., Efthymiopoulos, I., Einsweiler, K., Esposito, L., Esteban Muller, J., Evrard, S., Fabbricatore, P., Farinon, S., Fartoukh, S., Faus-Golfe, A., Favre, G., Felice, H., Feral, B., Ferlin, G., Ferracin, P., Ferrari, A., Ferreira, L., Fessia, P., Ficcadenti, L., Fiotakis, S., Fiscarelli, L., Fitterer, M., Fleiter, J., Foffano, G., Fol, E., Folch, R., Foraz, K., Foussat, A., Frankl, M., Frasciello, O., Fraser, M., Menendez, P. Freijedo, Fuchs, J-F., Furuseth, S., Gaddi, A., Gallilee, M., Gallo, A., Alia, R. Garcia, Gavela, H. Garcia, Matos, J. Garcia, Garcia Morales, H., Valdivieso, A. Garcia-Tabares, Garino, C., Garion, C., Gascon, J., Gasnier, Ch., Gentini, L., Gentsos, C., Ghosh, A., Giacomel, L., Hernandez, K. Gibran, Gibson, S., Ginburg, C., Giordano, F., Giovannozzi, M., Goddard, B., Gomes, P., Gonzalez De La Aleja Cabana, M., Goudket, P., Gousiou, E., Gradassi, P., Costa, A. Granadeiro, Grand-Clément, L., Grillot, S., Guillaume, JC., Guinchard, M., Hagen, P., Hakulinen, T., Hall, B., Hansen, J., Heredia Garcia, N., Herr, W., Herty, A., Hill, C., Hofer, M., Höfle, W., Holzer, B., Hopkins, S., Hrivnak, J., Iadarola, G., Infantino, A., Bermudez, S. Izquierdo, Jakobsen, S., Jebramcik, M.A., Jenninger, B., Jensen, E., Jones, M., Jones, R., Jones, T., Jowett, J., Juchno, M., Julie, C., Junginger, T., Kain, V., Kaltchev, D., Karastathis, N., Kardasopoulos, P., Karppinen, M., Keintzel, J., Kersevan, R., Killing, F., Kirby, G., Korostelev, M., Kos, N., Kostoglou, S., Kozsar, I., Krasnov, A., Krave, S., Krzempek, L., Kuder, N., Kurtulus, A., Kwee-Hinzmann, R., Lackner, F., Lamont, M., Lamure, A.L., m, L. Lari, Lazzaroni, M., Le Garrec, M., Lechner, A., Lefevre, T., Leuxe, R., Li, K., Li, Z., Lindner, R., Lindstrom, B., Lingwood, C., Löffler, C., Lopez, C., Lopez-Hernandez, LA., Losito, R., Maciariello, F., Macintosh, P., Maclean, E.H., Macpherson, A., Maesen, P., Magnier, C., Durand, H. Mainaud, Malina, L., Manfredi, M., Marcellini, F., Marchevsky, M., Maridor, S., Marinaro, G., Marinov, K., Markiewicz, T., Marsili, A., Martinez Urioz, P., Martino, M., Masi, A., Mastoridis, T., Mattelaer, P., May, A., Mazet, J., Mcilwraith, S., McIntosh, E., Medina Medrano, L., Mejica Rodriguez, A., Mendes, M., Menendez, P., Mensi, M., Mereghetti, A., Mergelkuhl, D., Mertens, T., Mether, L., Métral, E., Migliorati, M., Milanese, A., Minginette, P., Missiaen, D., Mitsuhashi, T., Modena, M., Mokhov, N., Molson, J., Monneret, E., Montesinos, E., Moron-Ballester, R., Morrone, M., Mostacci, A., Mounet, N., Moyret, P., Muffat, P., Muratori, B., Muttoni, Y., Nakamoto, T., Navarro-Tapia, M., Neupert, H., Nevay, L., Nicol, T., Nilsson, E., Ninin, P., Nobrega, A., Noels, C., Nolan, E., Nosochkov, Y., Nuiry, FX., Oberli, L., Ogitsu, T., Ohmi, K., Olave R., Oliveira, J., Orlandi, Ph., Ortega, P., Osborne, J., Otto, T., Palumbo, L., Papadopoulou, S., Papaphilippou, Y., Paraschou, K., Parente, C., Paret, S., Park, H., Parma, V., Pasquino, Ch., Patapenka, A., Patnaik, L., Pattalwar, S., Payet, J., Pechaud, G., Pellegrini, D., Pepinster, P., Perez, J., Espinos, J. Perez, Marcone, A. Perillo, Perin, A., Perini, P., Persson, T.H.B., Peterson, T., Pieloni, T., Pigny, G., Pinheiro de Sousa, J.P., Pirotte, O., Plassard, F., Pojer, M., Pontercorvo, L., Poyet, A., Prelipcean, D., Prin, H., Principe, R., Pugnat, T., Qiang, J., Quaranta, E., Rafique, H., Rakhno, I., Duarte, D. Ramos, Ratti, A., Ravaioli, E., Raymond, M., Redaelli, S., Renaglia, T., Ricci, D., Riddone, G., Rifflet, J., Rigutto, E., Rijoff, T., Rinaldesi, R., Riu Martinez, O., Rivkin, L., Rodriguez Mateos, F., Roesler, S., Romera Ramirez, I., Rossi, A., Rossi, L., Rude, V., Rumolo, G., Rutkovksi, J., Sabate Gilarte, M., Sabbi, G., Sahner, T., Salemme, R., Salvant, B., Galan, F. Sanchez, Santamaria Garcia, A., Santillana, I., Santini, C., Santos, O., Diaz, P. Santos, Sasaki, K., Savary, F., Sbrizzi, A., Schaumann, M., Scheuerlein, C., Schmalzle, J., Schmickler, H., Schmidt, R., Schoerling, D., Segreti, M., Serluca, M., Serrano, J., Sestak, J., Shaposhnikova, E., Shatilov, D., Siemko, A., Sisti, M., Sitko, M., Skarita, J., Skordis, E., Skoufaris, K., Skripka, G., Smekens, D., Sobiech, Z., Sosin, M., Sorbio, M., Soubelet, F., Spataro, B., Spiezia, G., Stancari, G., Staterao, M., Steckert, J., Steele, G., Sterbini, G., Struik, M., Sugano, M., Szeberenyi, A., Taborelli, M., Tambasco, C., Rego, R. Tavares, Tavian, L., Teissandier, B., Templeton, N., Therasse, M., Thiesen, H., Thomas, E., Toader, A., Todesco, E., Tomás, R., Toral, F., Torres-Sanchez, R., Trad, G., Triantafyllou, N., Tropin, I., Tsinganis, A., Tuckamantel, J., Uythoven, J., Valishev, A., Van Der Veken, F., Van Weelderen, R., Vande Craen, A., Vazquez De Prada, B., Velotti, F., Verdu Andres, S., Verweij, A., Shetty, N. Vittal, Vlachoudis, V., Volpini, G., Wagner, U., Wanderer, P., Wang, M., Wang, X., Wanzenberg, R., Wegscheider, A., Weisz, S., Welsch, C., Wendt, M., Wenninger, J., Weterings, W., White, S., Widuch, K., Will, A., Willering, G., Wollmann, D., Wolski, A., Wozniak, J., Wu, Q., Xiao, B., Xiao, L., Xu, Q., Yakovlev, Y., Yammine, S., Yang, Y., Yu, M., Zacharov, I., Zagorodnova, O., Zannini, C., Zanoni, C., Zerlauth, M., Zimmermann, F., Zlobin, A., Zobov, M., and Zurbano Fernandez, I.

Subjects
Accelerators and Storage Rings
Abstract

The Large Hadron Collider (LHC) is one of the largest scientific instruments ever built. Since opening up anew energy frontier for exploration in 2010, it has gathered a global user community of about 9000 scientists working in fundamental particle physics and the physics of hadronic matter at extreme temperature and density. To sustain and extend its discovery potential, the LHC will need a major upgrade in the 2020s. This will increase its instantaneous luminosity (rate of collisions) by a factor of five beyond the original design valueand the integrated luminosity (totalnumber of collisions) by a factor ten. The LHC is already a highly complexand exquisitely optimised machine so this upgrade must be carefully conceived and will require new infrastructures(underground and on surface)and over a decade to implement. The new configuration, known as High Luminosity LHC (HL-LHC), relies on a number of key innovations that push accelerator technology beyond its present limits. Among these are cutting-edge 11–12Tesla superconducting magnets, compact superconducting cavities for beam rotation with ultra-precise phase control, new technology and physical processes for beam collimation and 100 metre-long high-power superconducting links with negligible energy dissipation, all of which required several years of dedicated R&D; effort on a global international level. The present document describes the technologies and components that will be used to realise the projectand is intended to serve as the basis for the detailed engineering design of the HL-LHC.

Published
2020

25. Laser pulsing in linear Compton scattering

Author

Krafft, G. A., primary, Johnson, E., additional, Deitrick, K., additional, Terzić, B., additional, Kelmar, R., additional, Hodges, T., additional, Melnitchouk, W., additional, and Delayen, J. R., additional

Published
2016
Full Text
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26. Design and Prototyping of a 400 MHz RF-dipole Crabbing Cavity for the LHC High-Luminosity Upgrade

Author

De Silva, S U, Park, H, Delayen, J R, Li, Z, and Nicol, T H

Subjects
Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Physics::Accelerator Physics, Accelerators and Storage Rings
Abstract

LHC High Luminosity Upgrade is in need of two crabbing systems that deflects the beam in both horizontal and vertical planes. The 400 MHz rf-dipole crabbing cavity system is capable of crabbing the proton beam in both planes. At present we are focusing our efforts on a complete crabbing system in the horizontal plane. Prior to LHC installation the crabbing system will be installed for beam test at SPS. The crabbing system consists of two rfdipole cavities in the cryomodule. This paper discusses the electromagnetic design and mechanical properties of the rf-dipole crabbing system for SPS beam test.

Published
2015

28. HOM Damping Coupler Design for the 400-MHz RF Dipole Compact Crab Cavity for the LHC HiLumi Upgrade

Author

Li, Zenghai, Ge, Lixin, Delayen, J R, and de Silva, S U

Subjects
Physics::Accelerator Physics, Accelerators and Storage Rings
Abstract

Crab cavities are adapted as the baseline design for the LHC HiLumi upgrade to achieve head-on beam-beam collisions for further improvement in luminosity. A 400-MHz compact RF dipole crab cavity design was developed by a joint effort between Old Dominion University and SLAC under the support of US LARP program. This design has shown very favorable RF parameters and can fit into the available beamline spacing for either vertical and horizontal crabbing schemes. A niobium prototype cavity based on such a design has been manufactured for vertical test. In addition, there are stringent wakefield requirements that needed to be met for such a cavity in order to preserve the quality of the circulating beams. In this paper, we will discuss different damping schemes for such a compact design and present the HOM coupler designs to meet the damping requirements.

Published
2013

29. RF Control Modelling Issues for Future Superconducting Accelerators

Author

Hofler, A and Delayen, J R

Subjects
Accelerators and Storage Rings
Abstract

The development of superconducting accelerators has reached a high level of maturity following the successes of ATLAS at Argonne, CEBAF at Jefferson Lab, the TESLA Test Facility at DESY and many other operational accelerators. As a result many new accelerators under development (e.g. SNS) or proposed (e.g. RIA) will utilize this technology. Covering all aspects from cw to pulsed rf and/or beam, non-relativistic to relativistic particles, medium and high gradients, light to heavy beam loading, linacs, rings, and ERLs, the demands on the rf control system can be quite different for the various accelerators. For the rf control designer it is therefore essential to understand these issues and be able to predict rf system performance based on realistic rf control models. This paper will describe the features that should be included in such models and present an approach which will drive the development of a generic rf system model.

Published
2004

39. Design studies of high-luminoisty ring-ring electron-ion collider at CEBAF

Author

Bogacz, A., primary, Brindza, P., additional, Bruell, A., additional, Cardman, L., additional, Delayen, J., additional, Derbenev, Y., additional, Ent, R., additional, Evtushenko, P., additional, Grames, J., additional, Hutton, A., additional, Krafft, G., additional, Li, R., additional, Merminga, L., additional, Musson, J., additional, Poelker, M., additional, Thomas, A., additional, Wojtsekhowski, B., additional, Yunn, B., additional, Zhang, Y., additional, Fischer, W., additional, Montag, C., additional, Ostroumov, P., additional, Dudnikov, V., additional, Belov, A., additional, and Derenchuk, V., additional

Published
2007
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43. Niobium resonator development for high-brightness ion beam acceleration

Author

Bohn, C. L., Delayen, J. R., Bohn C. L., Roche C. T., and Roches, C. T.

Subjects
Physics::Accelerator Physics
Abstract

Two niobium resonant cavities for high-brightness ion beam acceleration have been constructed and tested. The first was based on a coaxial quarter-wave geometry and was optimized for phase velocity {beta}{sub o} = 0.15. This cavity, which resonates at 400 MHz in the fundamental mode, operated at an average (wall-to-wall) accelerating gradient of 12.9 MV/m under continuous-wave (cw) fields. At this gradient, a cavity Q of 1.4 {times} 10{sup 8} was measured. The second was based on a coaxial half-wave geometry and was optimized for {beta}{sub o} = 0.12. This cavity, which resonates at 355 MHz in the fundamental mode, operated at an average accelerating gradient of 18.0 MV/m under cw fields. This is the highest average accelerating gradient achieved to date in low-velocity structures designed for cw operation. At this gradient, a cavity Q of 1.2 {times} 10{sup 8} was measured.

Published
1991

44. High electric fields in a superconducting RFQ structure

Author

Delayen, J. R., Shepard K. W., and Shepard, K. W.

Abstract

High surface electric fields have been obtained in the first tests of a superconducting rf quadrupole device. The rf quadrupole fields were generated between niobium vanes 6.5 cm in length, with an edge radius of 2 mm, and with a beam aperture of 6 mm diameter. In tests at 4.2 K, the 64 MHz device operated cw at peak surface electric fields of 128 MV/m. Virtually no electron loading was observed at fields below 100 MV/m. It was possible to operate at surface fields of 210 MV/m in pulses of 1 msec duration using a 2.5 kW rf source. For the vane geometry tested, more than 10 square centimeters of surface support a field greater than 90% of the peak field. The present result indicates that electric fields greater than 100 MV/m can be obtained over an appreciable area, sufficient for some accelerator applications. It also shows that superconducting rf technology may provide an extended range of options for rf quadrupole design. 7 refs., 4 figs.

Published
1991

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